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Is the light blinking constantly or is there a long pause then more blinking. If constant check the lamp door switch . Usually it is broken or jammed. If you jumper it and the set comes on that it. 4 blinks is bad fan.

Hi,Is it Mitsubishi WD-52628 TV? please confirm model number.Unplug TV from AC outlet for couple of minutes, replug back in, turn power ON and check, still same problem? Lets read error code in TV, press Device and Menu buttons on front of TV at same time for 6 seconds that will activate error code read process. Led will flash in 2 sequence with half second pause. count it and let me know the error code to proceed.Thanks.

Resetting the TV If the buttons on the remote AND the buttons on the TV case do not work (channels do not change and you cannot open or navigate the menu), the TV has stopped responding. Reset the TV as follows:

NOTE: Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can save time. 1.Unplug the TV power cord from the power outlet.2.Unplug any connected devices (DVD, Set-top boxes, etc...)3.Press and hold the TV power button for five seconds.4.Plug the TV power cord back into the power outlet and turn on the TV.5.Open the on-screen menu to confirm that the TV is responding again.6.Turn off the TV and reconnect the devices.7.Turn on the TV.
If ever resetting is no effect then the problem is in the "DM board"The constant blinking green light means that the TV is not booting up. This is a common problem on this set.
Hope it may help you;
Regards,
VOTIT

Does it blink a certain amount of blinks pause a second or just blink constantly with no pauses? Let me know it will blink a code if its going into protected shutdown. And it will blink constantly for another reason.

The constant blinking green light means that the TV is not booting up. This is a common problem on this set.You need to remove the shield from the DM board (standing upright on the left where the DTV RF connector is)and inside you will see the four leaky capacitors (1000 MFD 16 VOLT)replace them,plug the TV in and wait 70 seconds for the blinking light to stop,then turn on the TV.The hard part will be removing the board from the TV(lots of screws and connectors,takes time)

You need to change the seven capacitors on the DM power supply board (inside the metal case on the left where your DTV tuner connects)They are 1000 MFD 16 VOLT capacitors and the tops are probably bulging outward because they are leaky- this is a common problem.When you lost power,the TV had to reboot itself but because of the leaky caps it never will and the green light keeps blinking.As long as you never lost power or unplugged the set the TV would of still worked.Once you change the parts and plug the set in the light will blink normaly for about a minute and when it stops blinking you can then turn on the TV.